knap

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Related to knapped: knappers

knap

[nap]
(mining engineering)
To break rock.
To improve the grade of ore by removing low-grade material manually by using a hammer.
References in periodicals archive ?
However, there are some artefacts that were probably brought already knapped to the site (see below).
Moreover, when the researchers provided the bead makers with glass, a substance with which they had not previously worked, only the experts successfully knapped it.
The rear wall against the cliffs has been replaced with a reinforced retaining wall, a party wall to the west has been rebuilt in concrete, and two exposed elevations have been reconstructed in a functional reinterpretation of the original with knapped flint facings and dressings of brick and stone.